Device
Operating
Temperature Range
Package
TCF6000
SEMICONDUCTOR
TECHNICAL DATA
PERIPHERAL CLAMPING
ARRAY
ORDERING INFORMATION
TCF6000D
TCF6000
TA = 40
to +85
C
SO8
Plastic DIP
PIN CONNECTIONS
Order this document by TCF6000/D
D SUFFIX
PLASTIC PACKAGE
CASE 751
(SO8)
8
1
VCC
Clamp
Clamp
Clamp
Gnd
Clamp
Clamp
Clamp
1
2
3
4
5
6
7
8
NO SUFFIX
PLASTIC PACKAGE
CASE 626
1
MOTOROLA ANALOG IC DEVICE DATA
Peripheral Clamping Array
The TCF6000 was designed to protect input/output lines of
microprocessor systems against voltage transients.
Optimized for HMOS System
Minimal Component Count
Low Board Space Requirement
No P.C.B. Track Crossovers Required
Applications Areas Include Automotive, Industrial,
Telecommunications and Consumer Goods
Figure 1. Representative Block Diagram and
Simplified Application
VDD
Micro
Computer
Cin
Gnd
Digital
Inputs
Analog
Inputs
Rin
Gnd
Pin
VRef
VCC
VRef
Generator
Gnd
Each Cell
Motorola, Inc. 1996
Rev 0
TCF6000
2
MOTOROLA ANALOG IC DEVICE DATA
MAXIMUM RATINGS
(TA = 25
C, unless otherwise noted, Note 1.)
Rating
Symbol
Value
Unit
Supply Voltage
VCC
6.0
V
Supply Current
Ii
300
mA
Clamping Current
IIK
50
mA
Junction Temperature
TJ
150
C
Power Dissipation (TA = + 85
C)
PD
400
m/W
Thermal Resistance (JunctionAmbient)
JA
100
C/W
Operating Ambient Temperature Range
TA
40 to +85
C
Storage Temperature Range
Tstg
55 to + 150
C
NOTE: 1. Values beyond which damage may occur.
ELECTRICAL CHARACTERISTICS
(TA = 25
C, 4.5
VCC
5.5 V, unless otherwise noted.)
Characteristics
Symbol
Min
Max
Unit
Positive Clamping Voltage (Note 2)
(IIK = 10 mA, 40
C
TA
+ 85
C)
V(IK)
VCC + 1.0
V
Positive Peak Clamping Current
IIK(P)
20
mA
Negative Peak Clamping Voltage
(IIK = 10 mA, 40
C
TA
+ 85
C)
V(IK)
0.3
V
Negative Peak Clamping Current
IIK(P)
20
mA
Output Leakage Current
(0 V
Vin
VCC)
(0 V
Vin
VCC, 40
C
TA
+ 85
C)
IL
ILT
1.0
5.0
A
Channel Crosstalk (ACT = 20 log IL/IIK)
ACT
100
dB
Quiescent Current (Package)
IB
2.0
mA
NOTE: 2. The device might not give 100% protection in CMOS applications.
CIRCUIT DESCRIPTION
To ensure the reliable operation of any integrated circuit
based electronics system, care has been taken that voltage
transients do not reach the device I/O pins. Most NMOS,
HMOS and Bipolar integrated circuits are particularly
sensitive to negative voltage peaks which can provoke
latchup or otherwise disturb the normal functioning of the
circuit, and in extreme cases may destroy the device.
Generally the maximum rating for a negative voltage
transients on integral circuits is 0.3 V over the whole
temperature range. Classical protection units have consisted
of diode/resistor networks as shown in Figures 2a and 2b.
The arrangement in Figure 2a does not, in general, meet
the specification and is therefore inadequate.
The problem with the solution shown if Figure 2b lies
mainly with the high current drain through the biassing
devices R1 and D3. A second problem exists if the input line
carries an analog signal. When Vin is close to the ground
potential, currents arising from leakage and mismatch
between D3 and D2 can be sourced into the input line, thus
disturbing the reading.
(a)
(b)
Figure 2. Classical Protection Circuits
VCC
D1
Vin
Rin
D2
Cin
Gnd
Gnd
C
D3
Vin Rin
Cin
R1
VCC
D2
C
D1
Figure 3 shows the clamping characteristics which
are common to each of the six cells in the Peripheral
Clamping Array.
As with the classical protection circuits, positive voltage
transients are clamped by means of a fast diode to the V
CC
supply line.
TCF6000
3
MOTOROLA ANALOG IC DEVICE DATA
0.3 V
+10 mA
IIK
0 V
10 mA
Low
Impedance
High
Low
Impedance
Impedance
VCC+
0.75 V Typ
Vin
VCC
Figure 3. Clamping Characteristics
APPLICATIONS INFORMATION
Figure 4 depicts a typical application in a microcomputer
based automotive ignition system.
The TCF6000 is being used not only to protect the
system's normal inputs but also the (bidirectional) serial
diagnostics port.
The value of the input resistors, Rin, is determined by the
clamping current and the anticipated value of the spikes.
Thus:
Rin =
V
IIK
where:
So, taking,
gives,
V
IIK
V
IIK
Rin
= Peak Volts (V)
= Clamping current (A)
= 300 V typically (SAE J1211)
= 10 mA (recommended)
= 30 k
Resistors of this value will not usually cause any problems
in MOS systems, but their presence needs to be taken into
account by the designer. Their effect will normally need to be
compensated for Bipolar systems.
Figure 4. Typical Automotive Application
Gnd
Gnd
VCC
Coil Drive
Coil Feedback
VCC
INT1
D1
D0
D2
B0
D6
B1
B2
VSS
Gnd
Serial Diagnostics
Ignition Module
Car
6X
Rin
3X
Cin
Gnd
Vbat
Vbat
RHall
Engine
Temperature
Hall
Effect
Pick Up
Pressure
Sensor
Battery
Volts
Gnd
MC6805S2
TCF6000
TCF6000
4
MOTOROLA ANALOG IC DEVICE DATA
The use of Cin is not mandatory, and is not recommended
where the lines to be protected are used for output or for both
input and output. For digital input lines, the use of a small
capacitor in the range of 50 pF to 220 pF is recommended as
this will reduce the rate of rise of voltage seen by the
TCF6000 and hence the possibility of overshoot.
In the case of the analog inputs, such as that from the
pressure sensor, the capacitor Cin is necessary for devices
such as the MC6805S2 shown, which present a low
impedance during the sampling period. The maximum value
for Cin is determined by the accuracy required, the time taken
to sample the input and the input impedance during that time,
while the maximum value is determined by the required
frequency response and the value of Rin.
Thus for a resistive input A/D connector where:
Ts
RD
Vin
k
Q1
Q2
ID
= Sample time (seconds)
= Device input resistance (
)
= Input voltage (V)
= Required accuracy (%)
= Charge on capacitor before sampling
= Charge on capacitor after sampling
= Device input current (A)
Q1Q2 =
k
Q1
100
Thus:
but,
and,
Q1
Q1Q2
= Cin Vin
= ID
Ts
so that, ID Ts =
k
CinVin
100
and, Cin (min) =
ID
Ts
Vin
k
Farad
so, Cin (min) =
100
Ts
k
RD
Farad
The calculation for a sample and hold type converter is
even simpler:
k
CH
= Required accuracy (%)
= Hold capacitor (Farad)
Cin (min) =
100
CH
k
Farad
For the MC6805S2 this comes out at:
Cin (min) =
100.25 pF
0.25
= 10 nF for 1/4% accuracy
TCF6000
5
MOTOROLA ANALOG IC DEVICE DATA
PLASTIC PACKAGE
CASE 62605
ISSUE K
D SUFFIX
PLASTIC PACKAGE
CASE 75105
(SO8)
ISSUE N
OUTLINE DIMENSIONS
1
4
5
8
F
NOTE 2
A
B
T
SEATING
PLANE
H
J
G
D
K
N
C
L
M
M
A
M
0.13 (0.005)
B
M
T
NOTES:
1. DIMENSION L TO CENTER OF LEAD WHEN
FORMED PARALLEL.
2. PACKAGE CONTOUR OPTIONAL (ROUND OR
SQUARE CORNERS).
3. DIMENSIONING AND TOLERANCING PER ANSI
Y14.5M, 1982.
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
A
9.40
10.16
0.370
0.400
B
6.10
6.60
0.240
0.260
C
3.94
4.45
0.155
0.175
D
0.38
0.51
0.015
0.020
F
1.02
1.78
0.040
0.070
G
2.54 BSC
0.100 BSC
H
0.76
1.27
0.030
0.050
J
0.20
0.30
0.008
0.012
K
2.92
3.43
0.115
0.135
L
7.62 BSC
0.300 BSC
M
10
10
N
0.76
1.01
0.030
0.040
_
_
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSIONS A AND B DO NOT INCLUDE
MOLD PROTRUSION.
4. MAXIMUM MOLD PROTRUSION 0.15 (0.006)
PER SIDE.
5. DIMENSION D DOES NOT INCLUDE DAMBAR
PROTRUSION. ALLOWABLE DAMBAR
PROTRUSION SHALL BE 0.127 (0.005) TOTAL
IN EXCESS OF THE D DIMENSION AT
MAXIMUM MATERIAL CONDITION.
SEATING
PLANE
1
4
5
8
C
K
4X
P
A
0.25 (0.010)
M
T B
S
S
0.25 (0.010)
M
B
M
8X
D
R
M
J
X 45
_
_
F
A
B
T
DIM
MIN
MAX
MIN
MAX
INCHES
MILLIMETERS
A
4.80
5.00
0.189
0.196
B
3.80
4.00
0.150
0.157
C
1.35
1.75
0.054
0.068
D
0.35
0.49
0.014
0.019
F
0.40
1.25
0.016
0.049
G
1.27 BSC
0.050 BSC
J
0.18
0.25
0.007
0.009
K
0.10
0.25
0.004
0.009
M
0
7
0
7
P
5.80
6.20
0.229
0.244
R
0.25
0.50
0.010
0.019
_
_
_
_
G
TCF6000
6
MOTOROLA ANALOG IC DEVICE DATA
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the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit, and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. "Typical" parameters which may be provided in Motorola
data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals"
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Opportunity/Affirmative Action Employer.
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TCF6000/D
*TCF6000/D*
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